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Lanthanide-centered superexcitation, previously limited to solids, can now be achieved in molecular complexes. This breakthrough enables near-infrared (NIR)-to-visible (VIS) light upconversion using tailored molecular designs.

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Area of Science:

  • Inorganic Chemistry
  • Materials Science
  • Photochemistry

Background:

  • Lanthanide-centered superexcitation is typically confined to solid-state materials due to limitations with high-energy oscillators.
  • Previous research focused on bulk solids and nanoparticles, limiting applications of this phenomenon.
  • Achieving efficient upconversion in molecular systems has been a significant challenge.

Purpose of the Study:

  • To demonstrate that molecular lanthanide-containing coordination complexes can overcome limitations associated with superexcitation.
  • To induce near-infrared (NIR)-to-visible (VIS) light upconversion in molecular systems.
  • To explore the design principles for achieving molecular upconversion through energy transfer.

Main Methods:

  • Designing molecular lanthanide-containing coordination complexes with specific electronic properties.
  • Utilizing linear-optical responses for successive absorption of two low-energy photons.
  • Engineering intramolecular intermetallic energy-transfer processes in multimetallic architectures.

Main Results:

  • Successfully induced NIR-to-VIS light upconversion in molecular lanthanide complexes.
  • Overcame the incompatibility of superexcitation with closely bound high-energy oscillators in molecular settings.
  • Demonstrated the efficacy of intramolecular energy transfer in multimetallic systems for controlled upconversion.

Conclusions:

  • Molecular lanthanide complexes can be engineered for efficient light upconversion, expanding beyond traditional solid-state limitations.
  • The design of multimetallic architectures and intramolecular energy transfer is key to programming molecular upconversion.
  • This work opens new avenues for developing molecular materials with advanced optical properties.